We propose a method of load-sharing which affects in a stream of the altitude tunnel on the large-scale models of aircraft with air-cushion undercarriage during experiments carried out on the screen when the models were vibrating on dynamic bench, measuring height, roll, pitch and yaw. We share loads on the groups of external forces and moments: aerodynamic ones, on the main engine of the power plant, the input pulse in the fan of discharge apparatus, of the air cushion, elements of flexible fence when contacting with the surface of the runway. The loads of the model are measured using multicomponent tensives. The division of the loads on the components allows to choose optimal parameters of aircraft elements. The processing algorithm of the tensively measured forces and moments eliminates interference of indication channels of tensives from each other and identifies all major components of the steady and unsteady aerodynamic derivatives required for the formation of the mathematical model of stability and controllability of these objects in different modes of their movement.